Sparrows are like avian cockroaches. Don't forget fowl pox. We had a horrible run of pox the end of this summer. The mosquitoes were so bad, even hiding in the nest boxes during the heat of the day only to come out at night to attack the chickens. Of course the virus is carried by the wild birds, and the sparrows are everywhere. I ended up cutting fresh lemon grass and putting in the nest boxes, coop and run several times a week to help repel the mosquitoes. Still trying to plug every hole the sparrows can squeeze through.That's good to know about keeping a dead body on a pole to ward off if it works. In my situation we don't mind the Crows in the neighborhood. They have NEVER come into the yard and never bother the hens. The closest they come is to sit on a telephone pole or the roof of a building. Crow flocks are excellent for chasing off Cooper's or Red-tailed Hawks around here and as long as the Crows stay out of our yard I don't mind their patrols of the area. However I wish a dead Sparrow on a pole would deter the scourge of Sparrow flocks that invade en masse!!!! Sparrows are not even native to the USA and were brought as cage pets by the British centuries ago and now they are the worst bird pest -- killing other bird species, robbing other species nests to make their own nests, and will flock-attack a bird as big as a Crow. Sparrows are horrible little devils for all their cuteness and my guess is that they'll be the pests that bring in disease as deadly as the AI to our backyard flocks. They already bring in lice/mites/worms!!!
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